Application Based On Gradient Luneberg Lens

Luneberg lens is a kind of dielectric lens antenna which can satisfy the smooth change of internal dielectric constant.The actual project adopts layered structure,and dielectric lens with a gradient index of refraction.With high gain,multi-beam and broadband characteristics,it is mostly used in satellite and marine communications,navigation and collision avoidance radar and other fields.In this thesis,the related research work for the application Luneberg lens,the main contents include:This thesis describes the research background and application scenarios of Luneberg lens antenna,showing the research and development process and the recent study based on dynamic.Secondly,the basic working principle and design scheme are briefly introduced,and the relevant knowledge of geometric optics,transform optics,and equivalent media.The coordinate transformation method is used to compress and design the Luneberg lens.Based on these related principles,the following three designs of the Luneberg lens are designed and verified.Thirdly,a planar Luneberg lens is designed for surface wave regulation.This lens performs longitudinal compression of a two-dimensional plane by means of coordinate transformation,and the working frequency is 15 GHz.Surface wave excited by the cylindrical surface wave launcher,a plane passing through Luneberg lens,a good conversion of near-field parallel to the surface wave.In this design process,it is proved that the method of designing the surface wave lens by using the artificial impedance surface method and the method of transforming optics is a feasible solution.Fourthly,a dielectric parallel-plate quasi-Luneberg lens is designed,and the multi-beam performance of the Luneberg lens is used to realize a beam scanning antenna that can be applied to millimeter waves.Through the composition of two kinds of substrates with high dielectric constant,non-metallic vias are passed between the plates to realize the dielectric constant distribution.The dielectric rectangular waveguide is used as the input feed for this antenna,and the radiating element uses a dielectric waveguide slot antenna array.Therefore,the lens has a flexible beam steering angle and the plus or minus 28 degree horizontal beam control is realized by using 7 input ports.Fifthly,a three-dimensional Luneberg lens with asymmetric upper and lower structure is designed.Taking 3D printing as the design idea and using the equivalent medium theory,two coordinate transformation methods are used to simultaneously design the aspheric Luneberg lens,and it can also guarantee the radiation performance of its antenna.In the past,a transform method could be used to design the Luneberg lens.This proves that the design method using the two methods can also ensure the performance of the Luneberg lens.